Meaning: Father of many nations. Great patriarch. Father of the faithful.
Gen 17:5 Neither shall thy name any more be called Abram, but thy name shall be Abraham; for a father of many nations have I made thee.
Romans 4:1 What shall we say then that Abraham our father, as pertaining to the flesh, hath found?
James 2:21 Was not Abraham our father justified by works, when he had offered Isaac his son upon the altar?